{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/br-6428ns-1.10/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-8776"}],"_cs_exploited":true,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["BR-6428NS 1.10"],"_cs_severities":["high"],"_cs_tags":["cve","buffer overflow","network device","router"],"_cs_type":"threat","_cs_vendors":["Edimax"],"content_html":"\u003cp\u003eA buffer overflow vulnerability, identified as CVE-2026-8776, has been discovered in Edimax BR-6428NS router version 1.10. The vulnerability resides within the POST Request Handler component, specifically in the \u003ccode\u003e/goform/formPPTPSetup\u003c/code\u003e file and its \u003ccode\u003eformPPTPSetup\u003c/code\u003e function. Successful exploitation of this vulnerability allows a remote attacker to potentially execute arbitrary code. The vulnerability stems from the inadequate handling of the \u003ccode\u003epptpUserName\u003c/code\u003e argument, which, when manipulated, leads to a buffer overflow condition. Publicly available exploit code exists, increasing the risk of active exploitation. The vendor was notified but has not responded.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies an Edimax BR-6428NS router version 1.10 with a publicly accessible web interface.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP POST request targeting the \u003ccode\u003e/goform/formPPTPSetup\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe crafted POST request includes the \u003ccode\u003epptpUserName\u003c/code\u003e parameter with a value exceeding the expected buffer size.\u003c/li\u003e\n\u003cli\u003eThe webserver receives the POST request and passes the \u003ccode\u003epptpUserName\u003c/code\u003e argument to the \u003ccode\u003eformPPTPSetup\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eformPPTPSetup\u003c/code\u003e function copies the overly long \u003ccode\u003epptpUserName\u003c/code\u003e into a fixed-size buffer without proper bounds checking.\u003c/li\u003e\n\u003cli\u003eThis buffer overflow overwrites adjacent memory regions, potentially including critical program data or execution pointers.\u003c/li\u003e\n\u003cli\u003eThe attacker gains the ability to execute arbitrary code on the router.\u003c/li\u003e\n\u003cli\u003eThe attacker could then use this access to modify router settings, intercept network traffic, or establish a persistent backdoor.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-8776 allows a remote attacker to execute arbitrary code on the Edimax BR-6428NS router. This could allow the attacker to gain full control of the device, potentially compromising the network it serves. Given the lack of vendor response and the availability of public exploits, affected devices are at significant risk. This is especially impactful for small businesses and home users who often lack sophisticated security measures.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect CVE-2026-8776 Exploitation Attempt — Malicious PPTP Username\u0026rdquo; to detect exploitation attempts (see below).\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for POST requests to \u003ccode\u003e/goform/formPPTPSetup\u003c/code\u003e with unusually long \u003ccode\u003epptpUserName\u003c/code\u003e values.\u003c/li\u003e\n\u003cli\u003eConsider using a web application firewall (WAF) to filter out malicious requests targeting the vulnerable endpoint.\u003c/li\u003e\n\u003cli\u003eIf possible, disable the PPTP functionality of the router if not required.\u003c/li\u003e\n\u003cli\u003eWhile a patch is unavailable, network segmentation can limit the impact of a compromised device.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-18T02:19:13Z","date_published":"2026-05-18T02:19:13Z","id":"https://feed.craftedsignal.io/briefs/2026-05-edimax-buffer-overflow/","summary":"A buffer overflow vulnerability (CVE-2026-8776) exists in Edimax BR-6428NS version 1.10 due to improper handling of the pptpUserName argument in the formPPTPSetup function, allowing a remote attacker to potentially execute arbitrary code.","title":"Edimax BR-6428NS Buffer Overflow Vulnerability (CVE-2026-8776)","url":"https://feed.craftedsignal.io/briefs/2026-05-edimax-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — BR-6428NS 1.10","version":"https://jsonfeed.org/version/1.1"}